6 Inventory Costing Mistakes CPG Brands Make That Crush Their Margins

6 Inventory Costing Mistakes CPG Brands Make That Crush Their Margins

Most CPG founders think they know their margins. They don't. They know their purchase price minus their retail price — which is a completely different number.

The most common CPG inventory costing mistakes all distort the same thing: real gross margin, which accounts for every cost to get the product to its first point of sale. When brands miss pieces of that cost picture, they can end up making pricing decisions, channel decisions, and growth investments based on numbers that may be 5-15 points more optimistic than reality.

These six mistakes are the most common ways that distortion gets built into CPG financial statements — and why it matters more right now, with tariff volatility making cost structures harder to predict than they've been in years.

1. Using purchase price instead of landed cost in your CPG cost of goods sold

The purchase order says $4.20 per unit. That's not your COGS.

Landed cost is what it actually costs to get that unit to your warehouse or 3PL. It includes ocean freight or air freight, port fees, customs duties and tariff charges, import brokerage fees, inland transportation, insurance, and any warehousing cost up to the first point of sale. This isn't optional bookkeeping preference — under GAAP (ASC 330) and the tax rules in IRC §471, inventory cost includes the expenditures incurred to bring the goods to their existing condition and location, not just the invoice price.

Depending on where you're manufacturing and how you're shipping, landed cost can easily add $0.60 to $1.50 per unit on top of a $4.20 purchase price.

If you're selling that unit through retail at $12 with a 50% wholesale price of $6, and you're recording COGS at $4.20, your reported gross margin is 30%. Your actual gross margin — using landed cost of $5.70 — is 5%. That's not a rounding error. That's a different business model.

This gap is also why so many CPG brands hit $3-5M in revenue and discover they're not actually profitable. The unit economics looked fine on the pitch deck. The pitch deck didn't include freight.

2. Not updating standard costs when tariff rates change

Standard costing is a legitimate accounting methodology. Using it as an excuse to avoid updating your cost structure is not.

A standard cost is a predetermined cost used as a benchmark for measuring actual cost variances. It's useful for budgeting, manufacturing analysis, and operational efficiency tracking. But it requires periodic updates when the underlying inputs change materially — and tariff rate changes are about as material as it gets.

A CPG brand that set standard costs in January based on a 10% tariff rate on Chinese-manufactured goods is using a fictional benchmark in June if those rates have changed. The variance analysis — which should tell you whether operations are running efficiently or inefficiently — becomes noise, because the "standard" is no longer the right target.

Every time tariff rates change on a significant input or category, update your standard costs. If your accounting system makes that hard to do, the problem isn't the tariffs — it's the system. Get off of it.

3. Treating retailer co-op advertising and slotting fees as marketing expenses

The retailer charges you $15,000 for shelf placement. The distributor charges a promotional allowance on every case. The club channel requires a co-op advertising contribution. You run all of it through marketing expense.

This is wrong — and it inflates both your top-line revenue and your marketing expense simultaneously, making both numbers look worse than they are.

Slotting fees, promotional allowances, and co-op advertising commitments are economically the cost of selling through a particular channel. Under ASC 606 and common sense, they reduce net revenue — they're contra-revenue items, not expenses. The distinction matters because it changes your apparent revenue figure, your gross margin percentage, and your channel-level profitability analysis.

A retailer channel that looks like it's generating $400,000 in revenue with $60,000 in "marketing expense" actually generates $340,000 in net revenue. Evaluating that channel against your DTC channel, which has no slotting fees, requires you to compare net revenue figures — otherwise the retail channel always looks artificially better on the top line.

4. Expensing packaging design and tooling as period costs

Custom packaging dies. Injection molds for bottle caps. Tooling for custom packaging formats. You pay for these once — or once per SKU iteration — and expense them in the month you receive the invoice.

This approach is simple. It's also not right.

Tooling and custom packaging dies have a useful life tied to the production volume they support. A mold that can produce 500,000 units before it needs replacement is an asset with economic value across those 500,000 units. Allocating the cost across those units — as a per-unit component of COGS — tells a more accurate margin story than writing off $35,000 of mold costs in the month they arrive.

Practically, this matters most when you're launching a new SKU. If you expense $50,000 of launch tooling in month one and then analyze that SKU's margin in months two through twelve, the SKU looks artificially profitable because the tooling cost is buried in a prior month's P&L. Your profitability analysis misleads you about whether to invest further in that SKU.

The correct treatment is to capitalize the tooling as an asset and amortize it into COGS based on expected production runs. Your accountant can set this up in your inventory system; it's not complicated, it just requires intentional setup.

5. The inventory costing mistake on your balance sheet: carrying dead stock at full cost

You have 8,000 units of a SKU that was discontinued six months ago. You have 15,000 units of a seasonal product that didn't sell through. You have off-spec inventory that a retailer rejected and returned. All of it is sitting on your balance sheet at full standard cost.

Under ASC 330 (Inventory), inventory must be carried at the lower of cost or net realizable value. Net realizable value is what you can actually sell the inventory for, net of costs to sell it. If you have inventory you can only move at 40% of standard cost, you're supposed to write it down to 40% of standard cost now — not when you eventually sell it.

Carrying stale inventory at full cost overstates your assets, overstates your working capital, and delays the internal conversation about whether to discontinue the SKU. It also makes your balance sheet look healthier than it is to lenders, investors, or acquirers who will eventually look closely.

A quarterly inventory review that identifies slow-moving and unsaleable SKUs and writes them down to NRV isn't just good accounting — it forces the strategic conversation about whether those SKUs should continue to exist. That conversation is almost always valuable to have sooner.

6. Not reconciling physical inventory to system counts quarterly

A 2% shrinkage variance sounds small. On $1,000,000 of inventory, it's $20,000 of unrecognized loss sitting silently in your balance sheet.

Physical inventory counts that only happen annually discover 12 months of shrinkage at once. At that point, the variance is too large to explain easily, the write-down hits the P&L in a single month, and you have no idea whether the losses came from theft, damage, fulfillment errors, receiving discrepancies, or system entry mistakes.

Quarterly cycle counts on your highest-value SKUs — not a full physical count necessarily, but a systematic rolling reconciliation — give you enough frequency to detect the source of variance while it's still traceable. A receiving error that inflates system counts by 3% for three months will be caught in a quarterly cycle count. It won't be caught when you do an annual count 10 months later.

The bookkeeping infrastructure for this isn't complex. It requires your 3PL or warehouse to participate in the count, and it requires someone who reconciles the physical count results to your accounting system immediately rather than letting them sit in a spreadsheet. If your accountant doesn't have a quarterly inventory reconciliation process, ask them to build one.

Get the Numbers Right Before You Scale

Every mistake on this list compounds as you grow — a 2-point margin distortion at $500K in revenue becomes a six-figure blind spot at $5M. Scaling a CPG brand on wrong unit economics is how founders can end up with $10M in revenue and no cash.

Ever Ledger specializes in CPG and product businesses — inventory costing, channel profitability, COGS structure, and the financial infrastructure growing brands actually need. Read their profile on Sam's List, see who they work with, and book an intro call before your next inventory close.